Compensating valve-gear.



COMPENSAUNG VALVE GEAR APPLICATION FILED NOV. 8, 1911.

Patented July 2, 1918.

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WALTER B. GORE, 01E ERIE, PENNSYLVANIA, ASSIGNOB T0 SKINNER ENGINE COMPANY, OF ERIE, PENNSYLVANIA, A CORPORATION.

COMPENSATING VALVE-GEAR.

Specification of Letters Patent.

Patented July 2, 1%16.

Application filed November 8, 1917. SeriaI No. 200,913.

' To all whom it may concern Be it known that T, WALTER B. GORR, citizen of the United States, residing at Erie, in the county of Erie and State of Pennsylvania, have invented certain new and useful Improvements in Compensating Valve-Gears, of which the following is a specification.

This invention relates to steam engine valve gears, and especially to means for overcoming distortion or variation of the valve timing incident to expansion of the cylinder.

With ordinary valve gears, expansion of the cylinder varies the relative position of the valves, causing an angular variation in the operating gear which produces defective action, as for example a longer opening of one valve than the other and otherwise improper timing.

The object of the present invention is to provide a very simple and effective means for correcting or preventing such variation. The invention is particularly applicable to puppet valves lifted by rocker cams as shown for example in the U. S. Patent #1933204 to L. G. Skinner.

In the accompanying drawings The figure is a side elevation, partly in section, of an engine provided with the improved gear.

Referring specifically to the drawings, 6 indicates the engine cylinder, 7 the valves at opposite ends thereof, the immediate operating mechanism for the valves being similar to that shown in said patent, including a bell-crank lever 8 and a cam rocker 9, supported by suitable boxes 10 mounted'on the cylinder. The shaft of each rocker has a projecting arm, the rocker near the frame end of the cylinder having its arm projecting downwardly as indicated at 11, and the arm of the rocker at the head end of the cylinder projecting upwardly as shown at 12. This arrangement may be reversed if desired, but the arms should project in opposite directions. The arm 11 is connected by a link 13 to one arm of an interposed lever 14 which is fulcrumed at 15 on the cylinder, and the arm 12 is connected by a link 16 to the other arm of the lever 14. Motion is imparted, as usual, by a reach rod 17 operated by an eccentric or otherwise, and connected to the arm 11.

Obviously when the reach rod is reciprocated the rocker arms 11 and 12 will be vibrated and the cams will operate the valves in the usual way.

By means of the interposed lever let be tween the links 13 and 16 expansion of the cylinder will not vary the angular relation of the gear with respect to the valves. As the cylinder expands, the head end moves outwardly, carrying with it the valve at that end, and the pivot .15 of the lever 14:, being located at the middle of the cylinder, also -moves the same way half the distance, and

consequently swings'sufficiently to allow the link 16 to follow the shift of the arm 12, without varying its angle, and at the same time the link 13 remains in the same position without varying the angle of the arm 11. The length of the lever 14 will be proportioned to the relative difference of distance of movement of the rocker arm 12 and the pivot 15, so that the shift of the link 16 equals the movement of the former. Accordingly under all conditions of expansion or contraction the timing or functions of the valves remains as controlled by the governor or otherwise, and no distortion or variation results.

It will be seen that this invention provides, in a very simple manner, means for correcting the defects referred to.

I claim:

1. The combination with an engine cylinder and valve, and a reciprocating operating rod for the valve, of means to compensate for relative variation of position of the rod and the valve incident to expansion of the cylinder, said means including a lever fulcrumed on the cylinder and movable therewith as the latter expands or contracts, said lever being operatively connected to the rod and the valve.

2. The combination with an engine cylinder, valve, and rocker for operating the valve, of a reach rod, and means connecting the rod and rocker to compensate for expansion of the cylinder, including a lever fulcrumed on the cylinder to move therewith as it expands.

3. The combination with an engine cylinder and valves at opposite ends thereof, of a valve gear for operating the valves, including a lever fulcrumed on the cylinder between the valves and rods operatively connected to opposite arms of the lever and to the valve respectively, the fulcrum of the lever being shiftable With the cylinder as the latter expands or contracts.

4:. The combination With an engine cylinder, valves at opposite ends thereof, and rockers for operating the valves, of operat- 'ing devices connected to the rockers and including a lever pivotally mounted ,onthe cylinder between the rockers, and links connecting opposite arms of the lever and the rockers.

5. The combination-of an engine cylinder,

valves atopposite ends thereof and rockers rockers, and means for operating the rockers.

6. The combination with a cylinder, and valve operating device at opposite ends thereof, of operating connections between said devices, to compensate for variation in distance therebetween incident to expansion or contraction of the cylinder, said connections including a lever pivoted on the cylinder.

In testimony whereof, I afiix my s1 gnature in presence of two witnesses.

WALTER B. GORR.

Witnesses vEDW. IIUBBARD, A. E. ROSE.

Emileeeithhs patentmay betobtained for five cents eaoh hy addressing the Commissioner of Patents.

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